void i2c_slave_init(uint8_t address){
// load address into TWI address register
- TWAR = (address << 1);
+ TWAR = address;
// set the TWCR to enable address matching and enable TWI, clear TWINT, enable TWI interrupt
TWCR = (1 << TWIE) | (1 << TWEA) | (1 << TWINT) | (1 << TWEN);
}